Fallax's Mask of Humor

When Fallax's Mask of Humor enters the battlefield, target player reveals his or her hand. Select up to 3 nonland cards from it and exile them.
{b}, {t}, Exile a card from your hand: Until end of turn, you can cast spells that were exiled from your opponents' hands. You may spend mana as though it were mana of any type to cast them.
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Just keep smiling. Just keep laughing. Keep the pain out of sight.